Turbine-driven locomotive provided with mechanical-power transmission



a 1 2 1,642,987 Sept 9 7 F. LJUNGSTROM ET AL.

TURBINE DRIVEN LOCOMOTIVE PROVIDED WITH MECHANICAL POWER TRANSMISSIONFiled April 15, 1922 5 Sheets-Sheet 1 Ezuzziara JTZ 'wzzya $120122 I .Z!0 be]: 1

I Sept. 20, 1927.

1,642,987 F. LJUNGSTRM ET AL TURBINE DRIVEN LOCOMOTIVE PROVIDED WITHMECHANICAL POWER TRANSMISSION Filed April 13, 1922 5 Sheets-Sheet 2mezzizma Zfi jawatz'zza F. LJUNGSTRGM ET AL TURBINE DRIVEN LOGOMOTIVEPROVIDED W-ITH MECHANICAL 7 POWER TRANSMISSION Filed April 13. '1922 5Sheets-Sheet 3' Sept. 20, 1927. 1,642,987

F. LJUNGSTRGM ET AL TURBINE DRIVEN LOCOMOTIVE PROVIDED WITH MECHANICALPOWER TRANSMISSION Filed April 15, 1922 5 SheetsSheet 4 lzzufllvibm1127110 1 .AZWfi.

1 1,642,987 Sept 927 F. LJUNGSTRGM ET AL TURBINE DRIVEN LOCOMOTIVEPROVIDED WITH MECHANICAL POWER TRANSMISSION -Filed April 13, 1922 5Sheets-Sheet 5 I \l ul m Patented i Sept. 20, 1927. 'A

, ITED STATES PATENT OFFICE.

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Y s'rooKnoLm; swnnnn, -A conroimrrom 1 TURBINE-DRIVEN" L'ooo'morIvnrnovmnn wi'rn MECHANICAL-POWER mimics- MISSION. J

Application filed April 18, 1922, Serial No.'552,412, and in SwedenFebruary 28 1922;

. I, 1 p s In turbine driven" locomotives, constructionsare known inwhich the power of the driving turbine is transmitted to thedrivingwheels'rby means of a mechanical power transmission, consistingof spur gears for two consecutively arranged toothed gearings for thereduction of the speed of the turbine. It has also been proposed not toemploy the slowest-rotating shaft of the toothed gearing as a drivingshaft, but only as a lay shaft connected withthe driving wheels by meansof coupling rods. The given load rofile as well as the limited spacehave cause diflicul ties, particularly in slower running freightlocomotives, to efiect the desired gearing down of the speed within thelimited space. The present invention has for its object to .removethesedrawbacksbv a mechanical power transmission facilitating a markedreduction within a small space, of the speed of the fast-runningturbine. J

The inventionrelates to an arrangement in turbine-driven locomotiveswhich are provided with mechanical power transmitting means consistingof a toothed gearing oper-- ating'with spur wheels, and the invention isprincipally characterized by the toothed gearing comprising gear wheelsfor at least three consecutive gear ratios' reducing the speed of theturbinelfl The invention consists further in arrangements for mountingthese spur gears betweenv the turbine and the driving wheels.

The accompanying drawings illustrate two embodiments iof the inventionwith three gear-ratios for .the' reduction of the speed.

vFig. 1 shows an elevation of an embodimentof the gearing down device,and Fig. 2 is a .section thereof on line A-A of Fig. l. Fig.

3 shows a section of a second embodiment f the invention on line D-wD ofFig. 4:, which shows an elevation oft-his embodiment with 1 certainparts broken away. Fig. 5 shows an elevation of alocomotive providedwith gearing down, devices constructed 'in accordance with theinvention.

- In Figs. 1 and 2, 1 denotes the turbine and 2 the lay shaftconnectedwith the cranks of the drivin' axles by means of coupling i'ods 3connecte with the cranks 4. The gearing is a double one, in that thesame 15 symmetrical along the line inFig. 2. The

5 turbine shaft 5'is coupled'to the shaft b of the first pinion 7 of thetoothed gearing, by

means of diaphragm couplings 8. The pin- 65 ion shaft is hollow and comrises'a second shaft which is connected y means of s ,diaph'ragms,partly with the said pinion drive the gear wheels 10 which .are attachedonto the same shaft 9 as the gearing and which carry the pinions 14,

which, finally, drive the gear wheels '15 attached onto the lay shaft 2.In this embodiment the pinions 7 and 11 are mounted together with theirshafts in a casing 17 which is spherically journalled inside the shaft13,

by means of a spherical bearing 16 so as to v.be movable in alldirections, said casing in known manner bringing about a uniform? toothpressure in the gearing and eliminat- -ing certain injurious forceswhich would otherwise be transmitted to'the turbine and interfere withthe operation thereof. The casing obtainsa certain margin of movement byreason of'the existence of the diaphragm 8. "The, casing 1'1 carries thetwo smaller so,

shafts 6 and 9. 1

Reversal is effected in known manner by the lay shaft 2, which ismounted in theframe 19 movably about the point 18, bein lowered so thatthe gear wheel 15 attache onto this shaft 2 will be brought out ofengagement with the pinion 14, whereupon an additional gear wheel 20adapted for reverse running is brought into engagement with the pinion14 as well as with the gear wheel 15, for instance by means of aneccentric movement not shown in the drawing. In additionto the toothedgearing being ,111 this case symmetrical with respect to the line B'B,it is also, so to say, divided intotwo parts, one of which is. enclosedin the mov- --able casing"17, while the other is. enciosed in the gearbox 21 which is mounted on the 1 frame of, the locomotive, for instancein such A a manner as to give the gear box a. certain margin of.movement.

In the embodiment shown in Figs. 3

4, the gearing is also symmetrical alon I a line, thatis line G-C, inFig. 3. 26-des1g-- hate the some shatt are smaller wheels- Sb, dri" .ng1e gear wheels attached to the lay sha t 32'. The lay shatt 3i" is connccted with the driving wheels ot the locomotive by means oi? coupling"rods and, to gcther with the shafts and 32 3, is mounted within a greatbox 39 which is located substantially umlerncath the turbine The pinions3G with their shaft 2d are mounted in a, movable casing 25., in a mannerabove described and previously lrnown, said casing 525 being sphericallyjournalled inside the shatt 32 by means ot a ball bearing so as to bemovable in all directions.

la this toothed gearing reversal is obtained by an additional gear wheell1 (ll ig'. l) being eccentrically mounted in the frame in such a mannerthat it may be rotated into engagel'nent with the gear wheel 35. Beforethis throwing into gear takes place, the pinions 33 and the gear Wheels35 are brought out of engagement with each other by the shatt 32 beingswung by means of the movable casing 25, in the direction of the arrow42, until it meets the reversing pinion all and is brought intoengagement therewith. ln this embodiment. too, the

gearing is in a certain sense divided in two parts, one oi which issituated in the gear hon 39, while the other is located in the movablecasing 25.

Uther embodiments of toothed gearings having three gear-ratios tor thereduction ot the speed-may be conceived, without the principle of theinvention being departed from; For instance, the gearing need not besymmetrical, but the turbine may, "for example, be adapted so as todrive only with the one shaft end thereof. However, the advantages ofsymmetrical gearings are obvious, in that oblique forces and axialpressures in the shaft are eliminated through the possibilitv of usingtwo gears having their teeth out obliquely with respect to each on theframe.

"of the present invention.

other, or so-called herringbone wheels. a manner described herein above,the gear box 39 may be mounted so as to be movable The gear wheels maybe mounted in the gear box on principles other than the above mentionedone, and they may be constructed in some other suitable way. Themounting of the machine set on the locomotive evidently does not affectthe scope Fig. 5 on tie drawing shows, as mentioned above, a locomotiveprovided with gearings constructed denser pertaining to in accordancewith the invention, the loco-- motive being oi? the type in which aconthe locomotive mounted. on a separate boiler car. 'lhen 5i denotesthe boiler car and 552 the corn denser cur, said cars being connectedwith each other by means oi a coupling 53 of lrnown type. ll'l ouulcd onthe boiler car 5i are two turbine sols lid: and 55, each pro vided witha toothed gearing comprising three gear-ratios tor the reduction of thespeed. said device gearing down the speed from that out the turbineshaft 56 and 5'? respectively to the speed ol the lay shafts and (39respectively. Un the condenser car 52 there are also mounted two turbinesets 59 and (30, which are also provided with toothed gearingscomprising three gear-ratios :tor the reduction ot the speed. lo theembodiment shown the turbines are connccted as high pressure andlowpressure turbines, in that the live steam. which first passes theturbine 58, will then flow through the turbines 5Q. 60 and G1 in theorder named. Ubviously. however, other connecting means are alsoconceivable. The locomotive may also be conceived as provided with oneturbine only having a toothed gearing' mounted in any of the placesshown in the drawing. The turbine set may, without the principle of theinvention being departed trom, be mounted in any other place of thelocomotive, in that the four given places are only to be regarded as themost suitable ones for the mounting of the turbine sets.

What we claim as new and desire to secure by Letters Patent ol theUnited States is:

l. A turbine driven locomotive having mechanical power transmittingmeans interposed between the turbine and the driving wheels of thelocomotive, said power transmitting means comprising spur gears for atleast three consecutive gear ratios for the reduction of the speed ofthe turbine, the slowest-runningshaft of the spur gearing, without beingitself a driving wheel aide, being connected by means of coupling rodsto at least one of the. driving wheel axles, the spur gearing beingsymmetrical with respect to a plane perpendicular to the axes of thegear wheels, and the turbine be ing situated between the first,fastest-running gears, said gears being disposed in spherically movablecasings located outside the consecutive portion ofthe spur gearing, anda box surrounding said latter portion of the gearin 2. A turbine-drivenlocomotive having mechanical power transmitting means interposed betweenthe turbine and the driving wheels of the locomotive, said powertransmitting means comprismg spur gears for at least three consecutivegear ratios for the reduction of the speed. of the turbine,

- cent spur wheels of the earing, and means for throwing one of saidlatter spur wheels intoand out of engagement with said toothed wheel andwith said adjacent spur wheel, the slowest running shaft of the spurgearing without being itself a driving wheel 1 axle being connected bymeans of coupling rods to at least one of the driving wheel axles.

In testimony whereof we aflix our signatures.

FREDRIK LJUNGSTROM. ISVIDOR BROBERG.

